HardLabs

Simple-Keyboard-Project

MRM1790·Simple-Keyboard-Project

Simple-Keyboard-Project PCB layout, top view — open source AVR/Arduino board by MRM1790

About the Simple-Keyboard-Project PCB

Simple-Keyboard-Project is an open source AVR/Arduino PCB design by MRM1790, published on GitHub. It is a 2-layer board measuring 285 × 94.6 mm, with 150 components from 76 distinct parts.

Its main chip is the ATMEGA32U4-A, from the AVR/Arduino family. Other key parts include the MIC5219-2.5YM5. By type, the board carries 67 switches, 63 diodes, 8 capacitors, 7 resistors, 2 ICs and 1 crystal.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

DIY keyboard from scratch for school projects.

ATTENTION: For the BOM files, designators, and CPL we recommended ordering through JLC PCB since it is configured in their version of excel and ordering process. QMK Toolbox will be needed to upload the code in the circuit board which a link will be provided here https://qmk.fm/toolbox

ATTENTION: THE SOFTWARE FOR THE KEYBOARD IS LABELED AS BOTH "KEYBOARD.JSON" AND "KEYMAP C" AND THE MAIN THING THAT YOU WILL NEED IS THE FILE THAT SAYS "jam61_default.HEX" then you will plug that into the QMK Toolbox application, and press the reset button on the circuit board in order to flash it. Once you hit…

Main components on the Simple-Keyboard-Project

ATMEGA32U4-AMIC5219-2.5YM5

Simple-Keyboard-Project bill of materials (BOM)

150 components, 76 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4-A
ATmega32U4-A
U1
1
MIC5219-2.5YM5
U2
1
16MHZ
Y1
1
USB_C_RECEPTACLE_USB2.0_16P
USB_C_Receptacle_USB2.0_16P
J2
1
500MA
500mA
F1
1
C2803348
Esc/Acc
SW1
1
C2803348
1!
SW2
1
C2803348
2@
SW3
1
C2803348
3#
SW4
1
C2803348
4$
SW5
1
5%
SW6
1
C2803348
6^
SW7
1
C2803348
7&
SW8
1
C2803348
8*
SW9
1
C2803348
9(
SW10
1
C2803348
0)
SW11
1
C2803348
-_
SW12
1
C2803348
=+
SW13
1
C2803348
BS
SW14
1
C2803348
Tab
SW15
Show 56 more
QtyPartRefs
1
C2803348
Q
SW16
1
C2803348
W
SW17
1
C2803348
E
SW18
1
C2803348
R
SW19
1
C2803348
T
SW20
1
C2803348
Y
SW21
1
C2803348
U
SW22
1
C2803348
I
SW23
1
C2803348
O
SW24
1
C2803348
P
SW25
1
C2803348
[{
SW26
1
C2803348
}]
SW27
1
C2803348
|\
SW28
1
C2803348
Caps LK
SW29
1
C2803348
A
SW30
1
C2803348
S
SW31
1
C2803348
D
SW32
1
C2803348
F
SW33
1
C2803348
G
SW34
1
C2803348
H
SW35
1
C2803348
J
SW36
1
C2803348
K
SW37
1
C2803348
L
SW38
1
C2803348
:;
SW39
1
C2803348
'"
SW40
1
C2803348
Enter
SW41
1
C2803348
Shift
SW42
1
C2803348
Z
SW43
1
C2803348
X
SW44
1
C2803348
C
SW45
1
C2803348
V
SW46
1
C2803348
B
SW47
1
C2803348
N
SW48
1
C2803348
M
SW49
1
C2803348
<.
SW50
1
C2803348
>.
SW51
1
C2803348
?/
SW52
1
C2803348
Shift (Right)
SW53
2
C2803348
Ctrl
SW54, SW61
2
C2803348
Windows
SW55, SW60
2
C2803348
Alt
SW56, SW58
1
C2803348
Spacebar
SW57
1
C2803348
Function
SW59
1
Stabilizer
SW62
4
Stabilizer
SW64, SW66, SW68, SW70
1
C2886894
Reset Switch
SW67
62
1N4148
D1, D2, D3, D4, D5, D6, D7, D8 +54
1
C9900221497
Red
D63
3
1UF
1uF
C1, C4, C7
2
22PF
22pF
C2, C3
2
10UF
10uF
C5, C6
1
0.1UF
0.1uF
C8
2
5.1K
R1, R2
2
22OHMS
22ohms
R3, R4
2
10K
R5, R7
1
1KOHMS
1Kohms
R6

Simple-Keyboard-Project design files

The KiCad project lives in the MRM1790/Simple-Keyboard-Project repository on GitHub; these links point at the commit this page was built from.

Simple-Keyboard-Project: common questions

What microcontroller does the Simple-Keyboard-Project use?

The Simple-Keyboard-Project is built around the ATMEGA32U4-A, from the AVR/Arduino family.

How big is the Simple-Keyboard-Project PCB?

The Simple-Keyboard-Project measures 285 × 94.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Simple-Keyboard-Project?

150 components, from 76 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Simple-Keyboard-Project design files?

From the MRM1790/Simple-Keyboard-Project repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Simple-Keyboard-Project design in my own project?

The repository has no license, so all rights stay with MRM1790. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Simple-Keyboard-Project without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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